Hide a Layer and Reveal Hidden Layers
Hide a Layer
To hide a layer, either click the layer name in the timeline diagram (if it's visible) or within the outline of the layers and events below the diagram.
The Edit Layer dialog will open.
Check the box, "Hide this layer" and then click Update Layer to save your changes.
Reveal Hidden Layers
To reveal a hidden layer, click the layer's name in the outline below the diagram.
The Edit Layer dialog will open. Uncheck the "Hide this layer" option and click Update Layer to display the hidden layer in the diagram.